View source: R/delay_difference.R
delay_diff | R Documentation |
delay_diff
implements a two-stage delay-difference
model with a weekly time-step after Dichmont 2003. Given the starting
biomass, overall mortality and recruitment it returns the biomass in wk+1.
delay_diff(
K = 0.3,
F = NULL,
M = 0.2,
wt = 1,
wtm1 = 0.1,
R = NULL,
B = NULL,
Bm1 = NULL,
al = NULL,
alm1 = NULL
)
K |
is a Numeric vector describing growth. Note:
K is transformed to rho with |
F |
is the weekly fishing mortality rate. |
M |
is a Numeric vector of the instantaneous rate of natural mortality for the population |
wt |
is a Numeric vector of the weight of a fish when fully recruited |
wtm1 |
is a Numeric vector of the weight of a fish before its recruited |
R |
is a Numeric vector of the annual recruitment for the population in numbers |
B |
is the biomass of the population during |
Bm1 |
is a Numeric vector of the biomass of the population in the previous week
|
al |
is a Numeric vector of the proportion of recruits to the fishery
in |
alm1 |
is a Numeric vector of the proportion of recruits to the fishery
in |
Returns the biomass at the beginning of the following week,
wk_{t+1}
delay_diff(K = 0.3, F = 0.2, M = 0.2, wt = 1, wtm1 = 0.1, R = 1e6, B = 1e5,
Bm1 = 1e4, al = 0.5, alm1 = 0.1)
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